Math Problem Statement

Use synthetic division and the Remainder Theorem to evaluate P(c). P(x) = 2x^7 + x^2 − 4, c = −1

Solution

To evaluate P(c)P(c) for P(x)=2x7+x24P(x) = 2x^7 + x^2 - 4 and c=1c = -1 using synthetic division and the Remainder Theorem, we proceed with the following steps:

Step 1: Write down the coefficients of P(x)P(x)

The polynomial is:

P(x)=2x7+x24P(x) = 2x^7 + x^2 - 4

Notice that there are missing terms in the polynomial (e.g., no x6,x5,x4,x3,x1x^6, x^5, x^4, x^3, x^1 terms). We need to account for these missing terms by adding zero coefficients:

P(x)=2x7+0x6+0x5+0x4+x2+0x14P(x) = 2x^7 + 0x^6 + 0x^5 + 0x^4 + x^2 + 0x^1 - 4

Thus, the coefficients are:

2,0,0,0,1,0,0,42, 0, 0, 0, 1, 0, 0, -4

Step 2: Set up the synthetic division

We will divide P(x)P(x) by x+1x + 1, which corresponds to c=1c = -1. For synthetic division, we use c=1c = -1 and the coefficients:

Coefficients: 2,0,0,0,1,0,0,4\text{Coefficients: } 2, 0, 0, 0, 1, 0, 0, -4

Step 3: Perform the synthetic division

Let's perform the synthetic division with c=1c = -1:

-1 & 2 & 0 & 0 & 0 & 1 & 0 & 0 & -4 \\ & & -2 & 2 & -2 & 2 & -3 & 3 & -3 \\ \hline & 2 & -2 & 2 & -2 & 3 & -3 & 3 & -7 \\ \end{array}$$ ### Step 4: Interpretation of the result The final number in the bottom row is the remainder when dividing by $$x + 1$$. This remainder is the value of $$P(-1)$$. $$P(-1) = -7$$ ### Step 5: Conclusion The value of $$P(-1)$$ is $$-7$$, which is the remainder from the synthetic division. Therefore: $$P(-1) = -7$$ --- Would you like a detailed breakdown of any specific part of the synthetic division process? Here are some related questions for further exploration:

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Math Problem Analysis

Mathematical Concepts

Polynomials
Synthetic Division
Remainder Theorem

Formulas

P(x) = 2x^7 + x^2 - 4
Remainder Theorem: P(c) = remainder of synthetic division

Theorems

Remainder Theorem

Suitable Grade Level

Grades 9-12